20551066 has 8 divisors (see below), whose sum is σ = 30959604. Its totient is φ = 10231200.

The previous prime is 20551061. The next prime is 20551067. The reversal of 20551066 is 66015502.

It can be written as a sum of positive squares in 2 ways, for example, as 19492225 + 1058841 = 4415^2 + 1029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20551066.

It is not an unprimeable number, because it can be changed into a prime (20551061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21585 + ... + 22516.

Almost surely, 2^20551066 is an apocalyptic number.

20551066 is a deficient number, since it is larger than the sum of its proper divisors (10408538).

20551066 is a wasteful number, since it uses less digits than its factorization.

20551066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44336.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20551066 is about 4533.3283578404. The cubic root of 20551066 is about 273.9122474597.

Adding to 20551066 its reverse (66015502), we get a palindrome (86566568).

The spelling of 20551066 in words is "twenty million, five hundred fifty-one thousand, sixty-six".